Reorganize exeflat.c, part 1, no functional changes.
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1351 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman
parent
266398c247
commit
d6232e9cd5
288
utils/exeflat.c
288
utils/exeflat.c
@ -59,7 +59,7 @@ typedef struct {
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UWORD off, seg;
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} farptr;
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int compReloc(const void *p1, const void *p2)
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static int compReloc(const void *p1, const void *p2)
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{
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farptr *r1 = (farptr *) p1;
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farptr *r2 = (farptr *) p2;
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@ -74,7 +74,7 @@ int compReloc(const void *p1, const void *p2)
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return 0;
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}
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void usage(void)
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static void usage(void)
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{
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printf("usage: exeflat (src.exe) (dest.sys) (relocation-factor)\n");
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printf
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@ -83,7 +83,13 @@ void usage(void)
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exit(1);
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}
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int main(int argc, char **argv)
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static void write_header(FILE *dest, size_t size);
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static void write_trailer(FILE *dest, size_t size, int compress_sys_file,
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exe_header *header);
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static int exeflat(int UPX, const char *srcfile, const char *dstfile,
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const char *start, short *silentSegments, short silentcount,
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int flat_exe)
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{
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static exe_header header; /* must be initialized to zero */
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int i, j;
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@ -94,57 +100,17 @@ int main(int argc, char **argv)
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UBYTE **buffers;
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UBYTE **curbuf;
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FILE *src, *dest;
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short silentSegments[20], silentcount = 0, silentdone = 0;
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int UPX = FALSE, flat_exe = FALSE, compress_sys_file = FALSE;
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short silentdone = 0;
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int compress_sys_file = FALSE;
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/* if no arguments provided, show usage and exit */
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if (argc < 4) usage();
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/* do optional argument processing here */
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for (i = 4; i < argc; i++)
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if ((src = fopen(srcfile, "rb")) == NULL)
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{
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char *argptr = argv[i];
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if (argptr[0] != '-' && argptr[0] != '/')
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usage();
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argptr++;
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switch (toupper(argptr[0]))
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if (UPX && strlen(srcfile) > 3)
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{
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case 'U':
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UPX = TRUE;
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break;
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case 'E':
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flat_exe = TRUE;
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break;
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case 'S':
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if (silentcount >= LENGTH(silentSegments))
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{
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printf("can't handle more then %d silent's\n",
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LENGTH(silentSegments));
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exit(1);
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}
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silentSegments[silentcount++] = (short)strtol(argptr + 1, NULL, 0);
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break;
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default:
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usage();
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}
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}
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/* arguments left :
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infile outfile relocation offset */
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if ((src = fopen(argv[1], "rb")) == NULL)
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{
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if (UPX && strlen(argv[1]) > 3)
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{
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strcpy(argv[1] + strlen(argv[1]) - 3, "sys");
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if ((src = fopen(argv[1], "rb")) == NULL)
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strcpy((char *)srcfile + strlen(srcfile) - 3, "sys");
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if ((src = fopen(srcfile, "rb")) == NULL)
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{
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printf("Source file %s could not be opened\n", argv[1]);
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printf("Source file %s could not be opened\n", srcfile);
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return 1;
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}
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compress_sys_file = TRUE;
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@ -156,17 +122,17 @@ int main(int argc, char **argv)
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} else {
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if (fread(&header, sizeof(header), 1, src) != 1)
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{
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printf("Error reading header from %s\n", argv[1]);
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printf("Error reading header from %s\n", srcfile);
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fclose(src);
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return 1;
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}
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if (header.exSignature != MAGIC)
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{
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printf("Source file %s is not a valid .EXE\n", argv[1]);
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printf("Source file %s is not a valid .EXE\n", srcfile);
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fclose(src);
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return 1;
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}
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start_seg = (UWORD)strtol(argv[3], NULL, 0);
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start_seg = (UWORD)strtol(start, NULL, 0);
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if (header.exExtraBytes == 0)
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header.exExtraBytes = 0x200;
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printf("header len = %lu = 0x%lx\n", header.exHeaderSize * 16UL,
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@ -250,48 +216,18 @@ int main(int argc, char **argv)
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if (flat_exe) {
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/* The biggest .sys file that UPX accepts seems to be 65419 bytes long */
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compress_sys_file = size < 65420;
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if (compress_sys_file && strlen(argv[2]) > 3)
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strcpy(argv[2] + strlen(argv[2]) - 3, "sys");
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if (compress_sys_file && strlen(dstfile) > 3)
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strcpy((char *)dstfile + strlen(dstfile) - 3, "sys");
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}
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if ((dest = fopen(argv[2], "wb+")) == NULL)
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if ((dest = fopen(dstfile, "wb+")) == NULL)
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{
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printf("Destination file %s could not be created\n", argv[2]);
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printf("Destination file %s could not be created\n", dstfile);
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return 1;
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}
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if (UPX)
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{
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/* UPX HEADER jump $+2+size */
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static char JumpBehindCode[] = {
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/* kernel config header - 32 bytes */
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0xeb, 0x1b, /* jmp short realentry */
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'C', 'O', 'N', 'F', 'I', 'G', 32 - 2 - 6 - 2 - 3, 0, /* WORD */
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0, /* DLASortByDriveNo db 0 */
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1, /* InitDiskShowDriveAssignment db 1 */
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2, /* SkipConfigSeconds db 2 */
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0, /* ForceLBA db 0 */
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1, /* GlobalEnableLBAsupport db 1 */
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0, /* BootHarddiskSeconds */
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'n', 'u', 's', 'e', 'd', /* unused filler bytes */
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8, 7, 6, 5, 4, 3, 2, 1,
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/* real-entry: jump over the 'real' image do the trailer */
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0xe9, 0, 0 /* 100: jmp 103 */
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};
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struct x {
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char y[sizeof(JumpBehindCode) == 0x20 ? 1 : -1];
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};
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if (size >= 0xfe00u)
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{
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printf("kernel; size too large - must be <= 0xfe00\n");
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exit(1);
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}
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/* this assumes <= 0xfe00 code in kernel */
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*(short *)&JumpBehindCode[0x1e] += (short)size;
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fwrite(JumpBehindCode, 1, 0x20, dest);
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write_header(dest, (size_t)size);
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}
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if (flat_exe && !compress_sys_file) {
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@ -328,48 +264,7 @@ int main(int argc, char **argv)
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if (UPX)
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{
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/* UPX trailer */
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/* hand assembled - so this remains ANSI C ;-) */
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/* move kernel down to place CONFIG-block, which added above,
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at start_seg-2:0 (e.g. 0x5e:0) instead of
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start_seg:0 (e.g. 0x60:0) and store there boot drive number
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from BL; kernel.asm will then check presence of additional
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CONFIG-block at this address. */
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static char trailer[] = { /* shift down everything by sizeof JumpBehindCode */
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0xB9, 0x00, 0x00, /* 0 mov cx,offset trailer */
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0x0E, /* 3 push cs */
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0x1F, /* 4 pop ds (=60) */
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0x8C, 0xC8, /* 5 mov ax,cs */
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0x48, /* 7 dec ax */
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0x48, /* 8 dec ax */
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0x8E, 0xC0, /* 9 mov es,ax */
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0x93, /* 11 xchg ax,bx (to get al=bl) */
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0x31, 0xFF, /* 12 xor di,di */
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0xFC, /* 14 cld */
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0xAA, /* 15 stosb (store drive number)*/
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0x8B, 0xF7, /* 16 mov si,di */
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0xF3, 0xA4, /* 18 rep movsb */
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0x1E, /* 20 push ds */
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0x58, /* 21 pop ax */
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0x05, 0x00, 0x00, /* 22 add ax,... */
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0x8E, 0xD0, /* 25 mov ss,ax */
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0xBC, 0x00, 0x00, /* 27 mov sp,... */
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0x31, 0xC0, /* 30 xor ax,ax */
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0xFF, 0xE0 /* 32 jmp ax */
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};
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*(short *)&trailer[1] = (short)size + 0x20;
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*(short *)&trailer[23] = header.exInitSS;
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*(short *)&trailer[28] = header.exInitSP;
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if (compress_sys_file) {
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/* replace by jmp word ptr [6]: ff 26 06 00
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(the .SYS strategy handler which will unpack) */
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*(long *)&trailer[30] = 0x000626ffL;
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/* set up a 4K stack for the UPX decompressor to work with */
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*(short *)&trailer[23] = 0x1000;
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*(short *)&trailer[28] = 0x1000;
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}
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fwrite(trailer, 1, sizeof trailer, dest);
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write_trailer(dest, (size_t)size, compress_sys_file, &header);
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}
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if (flat_exe && compress_sys_file) {
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/* overwrite first 8 bytes with SYS header */
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@ -386,3 +281,136 @@ int main(int argc, char **argv)
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header.exRelocItems, silentdone);
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return 0;
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}
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static void write_header(FILE *dest, size_t size)
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{
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/* UPX HEADER jump $+2+size */
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static char JumpBehindCode[] = {
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/* kernel config header - 32 bytes */
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0xeb, 0x1b, /* jmp short realentry */
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'C', 'O', 'N', 'F', 'I', 'G', 32 - 2 - 6 - 2 - 3, 0, /* WORD */
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0, /* DLASortByDriveNo db 0 */
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1, /* InitDiskShowDriveAssignment db 1 */
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2, /* SkipConfigSeconds db 2 */
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0, /* ForceLBA db 0 */
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1, /* GlobalEnableLBAsupport db 1 */
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0, /* BootHarddiskSeconds */
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'n', 'u', 's', 'e', 'd', /* unused filler bytes */
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8, 7, 6, 5, 4, 3, 2, 1,
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/* real-entry: jump over the 'real' image do the trailer */
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0xe9, 0, 0 /* 100: jmp 103 */
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};
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struct x {
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char y[sizeof(JumpBehindCode) == 0x20 ? 1 : -1];
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};
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if (size >= 0xfe00u)
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{
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printf("kernel; size too large - must be <= 0xfe00\n");
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exit(1);
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}
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/* this assumes <= 0xfe00 code in kernel */
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*(short *)&JumpBehindCode[0x1e] += (short)size;
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fwrite(JumpBehindCode, 1, 0x20, dest);
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}
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static void write_trailer(FILE *dest, size_t size, int compress_sys_file,
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exe_header *header)
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{
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/* UPX trailer */
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/* hand assembled - so this remains ANSI C ;-) */
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/* well almost: we still need packing and assume little endian ... */
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/* move kernel down to place CONFIG-block, which added above,
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at start_seg-2:0 (e.g. 0x5e:0) instead of
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start_seg:0 (e.g. 0x60:0) and store there boot drive number
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from BL; kernel.asm will then check presence of additional
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CONFIG-block at this address. */
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static char trailer[] = { /* shift down everything by sizeof JumpBehindCode */
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0xB9, 0x00, 0x00, /* 0 mov cx,offset trailer */
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0x0E, /* 3 push cs */
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0x1F, /* 4 pop ds (=60) */
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0x8C, 0xC8, /* 5 mov ax,cs */
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0x48, /* 7 dec ax */
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0x48, /* 8 dec ax */
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0x8E, 0xC0, /* 9 mov es,ax */
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0x93, /* 11 xchg ax,bx (to get al=bl) */
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0x31, 0xFF, /* 12 xor di,di */
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0xFC, /* 14 cld */
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0xAA, /* 15 stosb (store drive number)*/
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0x8B, 0xF7, /* 16 mov si,di */
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0xF3, 0xA4, /* 18 rep movsb */
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0x1E, /* 20 push ds */
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0x58, /* 21 pop ax */
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0x05, 0x00, 0x00, /* 22 add ax,... */
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0x8E, 0xD0, /* 25 mov ss,ax */
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0xBC, 0x00, 0x00, /* 27 mov sp,... */
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0x31, 0xC0, /* 30 xor ax,ax */
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0xFF, 0xE0 /* 32 jmp ax */
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};
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*(short *)&trailer[1] = (short)size + 0x20;
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*(short *)&trailer[23] = header->exInitSS;
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*(short *)&trailer[28] = header->exInitSP;
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if (compress_sys_file) {
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/* replace by jmp word ptr [6]: ff 26 06 00
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(the .SYS strategy handler which will unpack) */
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*(long *)&trailer[30] = 0x000626ffL;
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/* set up a 4K stack for the UPX decompressor to work with */
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*(short *)&trailer[23] = 0x1000;
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*(short *)&trailer[28] = 0x1000;
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}
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fwrite(trailer, 1, sizeof trailer, dest);
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}
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int main(int argc, char **argv)
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{
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short silentSegments[20], silentcount = 0;
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int UPX = FALSE, flat_exe = FALSE;
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int i;
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/* if no arguments provided, show usage and exit */
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if (argc < 4) usage();
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/* do optional argument processing here */
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for (i = 4; i < argc; i++)
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{
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char *argptr = argv[i];
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if (argptr[0] != '-' && argptr[0] != '/')
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usage();
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argptr++;
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switch (toupper(argptr[0]))
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{
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case 'U':
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UPX = TRUE;
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break;
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case 'E':
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flat_exe = TRUE;
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break;
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case 'S':
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if (silentcount >= LENGTH(silentSegments))
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{
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printf("can't handle more then %d silent's\n",
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LENGTH(silentSegments));
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exit(1);
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}
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silentSegments[silentcount++] = (short)strtol(argptr + 1, NULL, 0);
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break;
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default:
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usage();
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}
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}
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/* arguments left :
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infile outfile relocation offset */
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return exeflat(UPX, argv[1], argv[2], argv[3], silentSegments, silentcount,
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flat_exe);
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}
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